Tranexamic Acid During Cystectomy Trial (TACT)

Removal of the bladder and adjacent organs in patients with bladder cancer (radical cystectomy) often results in significant blood loss, and approximately 60% of patients require peri-operative blood transfusion. Reducing blood loss and the frequency of transfusion offers several benefits, including donor blood conservation, health care cost reduction, and avoidance of blood product exposure. Tranexamic acid is an amino acid lysine derivative with strong antifibrinolytic clotting properties that can be administered systemically. This medication has been used in a variety of operative procedures, notably in high risk cardiac surgery, to decrease peri-operative blood loss, and it is associated with an acceptable risk of adverse events. Systemic anti-hemorrhagics are infrequently used during radical cystectomy, and to the investigators knowledge their effects have not been evaluated in a clinical trial.

Overall objective: To conduct a randomized controlled trial of systemic tranexamic acid compared to placebo in reducing the number of blood transfusions in patients undergoing radical cystectomy for bladder cancer.

Design: A multi-center, randomized, double-blinded, placebo controlled trial.

Study population: Consenting patients 18 years of age and older undergoing a radical cystectomy for bladder cancer, excluding those who: are unwilling to receive blood products due to personal reasons, are pregnant, have active angina, have a known allergy to tranexamic acid, or have a known personal history of deep venous thrombosis, atrial fibrillation, coronary stent, sub-arachnoid hemorrhage, pulmonary embolism, thrombotic stroke and / or acquired disturbance of colour vision. The study will recruit 354 patients from Dalhousie University, McGill University, Université de Montreal, Université Laval, University of Ottawa, University of Western Ontario and University of Alberta.

Intervention:

Tranexamic Acid arm: Tranexamic acid will be administered as an intravenous infusion of 10 mg/kg within 10 minutes (loading dose) and before surgical incision, followed by 5 mg/kg/hour continuous maintenance infusion for the length of surgery (typically 4 to 8 hours). For example, an 80 kg patient would receive 800 mg prior to incision and a 400 mg/hour infusion for the duration of surgery. For a 6 hour procedure, the total dose administered would be 3200 mg.

Placebo arm: As there is no standard of care concerning administration of antifibrinolytic agents in cystectomy procedures, controls will follow the same dosing and schedule described above, but with 0.9% saline infusion.

Outcomes: The primary research objective is whether the use of systemic tranexamic acid compared to placebo reduces the proportion of radical cystectomy patients requiring red blood cell transfusion up to 30 days post-operative (from a 50% transfusion rate with placebo to 35% with tranexamic acid). Secondary questions are: Will use of systemic tranexamic acid compared to placebo result in reductions in: i) intraoperative blood loss, ii) amounts of transfused blood products, and iii) post-operative complications? The safety (thrombotic events) of tranexamic acid will also be evaluated.

Importance of this study: If tranexamic acid reduces the number of blood transfusions, there will be an immediate impact to cystectomy patients, and surgeons may consider the routine use of systemic tranexamic acid during similar abdomino-pelvic procedures associated with significant blood loss.

Inclusion criteria

• Participant ≥ 18 years at time of consent
• Participant has bladder cancer and will undergo radical cystectomy to remove bladder
• Participant is willing to receive blood products (i.e. packed red blood cells, platelets, plasma)
• Have obtained Informed Consent

Exclusion criteria

• Participant declines consent
• Participants incapable (incompetent) of providing Informed Consent
• Participant is under 18 years
• Participant is unwilling to receive blood products due to personal reasons
• Participant has thromboembolic disease (active or diagnosed within 1 year) such as deep vein thrombosis, pulmonary embolism or cerebral thrombosis)
• Participant with known personal history of subarachnoid haemorrhage.
• Participant has acquired disturbances to his / her colour vision (does not apply to congenital colour blindness)
• Participant is pregnant (confirmed by βHCG test)
• Participant has a known allergy to tranexamic acid